fix: pass convert_sets argument to union functions

Author: ydylla

serde/se.py

@@ -370,7 +370,7 @@ def {{func}}(obj, reuse_instances = {{serde_scope.reuse_instances_default}}, con
 
 def render_union_func(cls: Type, union_args: List[Type]) -> str:
     template = """
-def {{func}}(obj, reuse_instances):
+def {{func}}(obj, reuse_instances, convert_sets):
   {% for name in serde_scope.types.keys() %}
   {{name}} = serde_scope.types['{{name}}']
   {% endfor %}
@@ -553,7 +553,7 @@ def str(self, arg: SeField) -> str:
 
     def union_func(self, arg: SeField) -> str:
         func_name = union_func_name(UNION_SE_PREFIX, type_args(arg.type))
-        return f"serde_scope.funcs['{func_name}']({arg.varname}, reuse_instances)"
+        return f"serde_scope.funcs['{func_name}']({arg.varname}, reuse_instances, convert_sets)"
 
 
 def enum_value(cls, e):

tests/test_union.py

@@ -1,7 +1,7 @@
 import logging
 from dataclasses import dataclass
 from ipaddress import IPv4Address
-from typing import Dict, List, Optional, Union, Tuple
+from typing import Dict, List, Optional, Tuple, Union
 from uuid import UUID
 
 import pytest
@@ -292,6 +292,25 @@ class Foo:
     assert from_dict(Foo, {'BarBaz': 'foo'}) == Foo('foo')
 
 
+def test_union_with_list_of_other_class():
+    @deserialize
+    @serialize
+    @dataclass
+    class A:
+        a: int
+
+    @deserialize
+    @serialize
+    @dataclass
+    class B:
+        b: Union[List[A], str]
+
+    b = B([A(1)])
+    b_dict = {"b": [{"a": 1}]}
+    assert to_dict(b) == b_dict
+    assert from_dict(B, b_dict) == b
+
+
 # relates to https://github.com/yukinarit/pyserde/issues/113
 def test_union_with_union_in_nested_types():
     @deserialize